:root {
    --navy: #0b1f3a;
    --glass: #12345a;
    --teal: #1a8a8a;
    --gold: #c9a24a;
    --paper: #f4f7fb;
    --ink: #122033;
    --mute: #5a6b7e;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "IBM Plex Sans", "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.65;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }

.skyline {
    height: 6px;
    background: linear-gradient(90deg, var(--navy) 0 18%, var(--teal) 18% 22%, var(--navy) 22% 41%, var(--gold) 41% 43%, var(--navy) 43% 70%, var(--teal) 70% 76%, var(--navy) 76% 100%);
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(11, 31, 58, 0.96);
    color: #e8eef6;
    border-bottom: 1px solid rgba(201, 162, 74, 0.35);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 70px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.logo-mark {
    width: 30px;
    height: 36px;
    display: grid;
    place-items: center;
    background: var(--teal);
    color: #fff;
    font-size: 15px;
    clip-path: polygon(0 8%, 100% 0, 100% 100%, 0 92%);
}
.logo small { display: block; font-size: 10px; color: var(--gold); letter-spacing: 0.14em; font-weight: 500; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 6px 12px;
    border: 1px solid var(--gold);
    color: var(--gold);
    font-size: 12px;
    letter-spacing: 0.08em;
}
.nav-menu { display: flex; gap: 15px; flex: 1; font-size: 13px; }
.nav-menu a { color: #b7c4d4; }
.nav-menu a.active, .nav-menu a:hover { color: #fff; border-bottom: 2px solid var(--gold); }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 9px 16px;
    background: var(--gold);
    color: var(--navy);
    font-weight: 700;
    font-size: 13px;
}
.btn:hover { background: #ddb65d; }
.btn-lg { padding: 12px 22px; }
.btn-ghost {
    background: transparent;
    color: #e8eef6;
    border: 1px solid #4d6580;
}

.hero {
    padding: 56px 0 48px;
    background:
        linear-gradient(180deg, #0b1f3a 0%, #12345a 68%, #0e2744 100%);
    color: #e8eef6;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 36px;
    align-items: center;
}
.hero-kicker {
    color: var(--gold);
    letter-spacing: 0.12em;
    font-size: 12px;
    text-transform: uppercase;
    margin-bottom: 10px;
}
.hero h1 {
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.18;
    margin-bottom: 14px;
}
.hero p { color: #c3cedb; max-width: 40em; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.hero-visual {
    position: relative;
    padding: 14px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(201, 162, 74, 0.35);
    box-shadow: 0 24px 48px rgba(0,0,0,0.28);
}
.hero-visual img { width: 100%; }
.tower-cap {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 8px;
    background: var(--navy);
    color: var(--gold);
    font-size: 10px;
    letter-spacing: 0.12em;
}

.data-band { background: #fff; padding: 0; }
.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}
.data-grid > div {
    padding: 22px 18px;
    border-right: 1px solid #e3e9f0;
}
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 26px; font-weight: 700; color: var(--navy); }
.data-label { color: var(--mute); font-size: 13px; }

.section { padding: 52px 0; }
.section.alt { background: #eaf0f6; }
.section-head { margin-bottom: 22px; }
.section-head h2 { font-size: 26px; color: var(--navy); margin-bottom: 6px; }
.section-head p { color: var(--mute); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
    padding: 20px;
    background: #fff;
    border-top: 3px solid var(--teal);
    box-shadow: 0 8px 24px rgba(11, 31, 58, 0.06);
}
.card.main { border-top-color: var(--gold); }
.card h3 { margin: 8px 0; font-size: 18px; color: var(--navy); }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--navy);
    color: var(--gold);
    font-size: 11px;
    font-weight: 700;
}
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 164px; width: 100%; object-fit: cover; }
.solution-card div { padding: 16px 18px 20px; }
.price { color: var(--teal); font-weight: 700; margin-bottom: 8px; }

.cta {
    padding: 56px 0;
    text-align: center;
    background: var(--navy);
    color: #e8eef6;
}
.cta h2 { font-size: 28px; margin-bottom: 8px; }
.cta p { color: #b7c4d4; margin-bottom: 20px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn-ghost { color: #e8eef6; }

.site-footer {
    padding: 36px 0 16px;
    background: #081628;
    color: #c3cedb;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 22px; }
.footer-grid h4 { color: var(--gold); margin-bottom: 10px; font-size: 13px; letter-spacing: 0.08em; }
.footer-grid a, .footer-grid p { display: block; color: #9aacbe; margin-bottom: 6px; font-size: 13px; }
.footer-bottom {
    margin-top: 22px;
    padding-top: 12px;
    border-top: 1px solid #1a3150;
    color: #7d8fa3;
    font-size: 12px;
}

.page-hero {
    padding: 42px 0 8px;
    background: var(--navy);
    color: #e8eef6;
}
.page-hero h1 { font-size: 32px; margin: 8px 0; }
.page-hero p { color: #c3cedb; max-width: 44em; }
.dl-list, .help-list { display: grid; gap: 12px; }
.dl-item, .help-box {
    padding: 20px 22px;
    background: #fff;
    border-left: 4px solid var(--teal);
    box-shadow: 0 8px 20px rgba(11, 31, 58, 0.05);
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { border-left-color: var(--gold); }
.specs { display: flex; gap: 12px; color: var(--teal); font-size: 12px; margin: 6px 0; font-weight: 700; }
.shot { margin-top: 22px; border: 1px solid #d7e0ea; }
.shot img { width: 100%; }

@media (max-width: 900px) {
    .nav-burger { display: inline-block; }
    .nav-menu, .nav-actions { display: none; }
    .nav-toggle:checked ~ .nav-menu,
    .nav-toggle:checked ~ .nav-actions {
        display: flex;
        flex-direction: column;
        width: 100%;
        padding-bottom: 14px;
    }
    .nav-wrap { flex-wrap: wrap; }
    .hero-grid, .grid-3, .data-grid, .footer-grid, .dl-item { grid-template-columns: 1fr; display: grid; }
    .data-grid > div { border-right: 0; border-bottom: 1px solid #e3e9f0; }
}